Piezoelectric electroacoustic transducer

Abstract

A piezoelectric electroacoustic transducer is provided, including a three-dimensional structure, at least a piezoelectric element, and at least a membrane. The three-dimensional structure is formed to have a top portion and a side portion integrally connected to the top portion by press molding a plate. The side portion has at least a gap and is separated into a plurality of pillars by the at least a gap. The at least a piezoelectric element is disposed on the top portion, and the at least a membrane covers the at least a gap of the side portion. The piezoelectric electroacoustic transducer in the present disclosure is capable of being implemented as a loudspeaker or a microphone.

What is claimed is: 
     
       1. A piezoelectric electroacoustic transducer, comprising:
 a three-dimensional structure, including a top portion and a side portion integrally connected to the top portion, wherein the side portion has at least a gap; 
 at least a piezoelectric element provided on the top portion; and 
 at least a membrane covering the at least a gap of the side portion. 
 
     
     
       2. The piezoelectric electroacoustic transducer of  claim 1 , wherein the three-dimensional structure is formed to have the top portion and the side portion integrally connected to the top portion by press molding a plate. 
     
     
       3. The piezoelectric electroacoustic transducer of  claim 1 , wherein the side portion is separated into a plurality of pillars by the at least a gap. 
     
     
       4. The piezoelectric electroacoustic transducer of  claim 3 , wherein the side portion has 3 to 24 pillars. 
     
     
       5. The piezoelectric electroacoustic transducer of  claim 3 , wherein the pillar has a width within a range of 2 mm to 6 mm. 
     
     
       6. The piezoelectric electroacoustic transducer of  claim 3 , wherein the pillar is trapezoid, rectangular, or triangular. 
     
     
       7. The piezoelectric electroacoustic transducer of  claim 1 , wherein the top portion is rectangular, circular, or elliptical. 
     
     
       8. The piezoelectric electroacoustic transducer of  claim 1 , wherein the piezoelectric element is rectangular, circular, or elliptical. 
     
     
       9. The piezoelectric electroacoustic transducer of  claim 1 , wherein the top portion has an inner surface and an outer surface opposing the inner surface, and the piezoelectric element is provided on at least one of the inner surface and the outer surface. 
     
     
       10. The piezoelectric electroacoustic transducer of  claim 1 , further comprising at least a through hole formed on the top portion, the side portion, or the membrane. 
     
     
       11. The piezoelectric electroacoustic transducer of  claim 1 , wherein the membrane is made of organic macromolecule and has a thickness within a range of 10 μm to 300 μm. 
     
     
       12. The piezoelectric electroacoustic transducer of  claim 1 , wherein the three-dimensional structure is made of a metal plate or a sandwich composite consisting of a metal plate, a polymer film and a metal plate in series and having a thickness within a range of 30 μm to 200 μm.